David kennedy



(No ModeL) D. KENNEDY.

ELBVATOR. v v10,315,634 Patented Apr. 14, 1885.

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Illll l vwl/,111111111111111 UNITED STATES PATENT Ormeag DAVID KENNEDY, OF DETROIT, MICHIGAN, ASSIGNOR TO KENNEDY it GREIG, OF SAME PLACE.

ELEVATO R.

SPECIFICATION forming part of Letters vPatent No. 315,634, dated April 14, 1885.

.To all whom it may concern:

Be it known that I, DAVID KENNEDY, of Detroit, in the county of Wayne and State of Michigan, have invented new and useful 1mprovements in Elevators; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing, which form a part of this specification.

This invention relates to certain new and useful improvements 'in elevating mechanism such as is employed for raising and lowering platforms or carriages in elevator-shafts or for similar purposes, by means of which improvementsa perfect control of the speed is obtained and a certain means had for arresting the platform or elevator at any desired point.

In the accompanying drawing, which forms a part of this specification, A represents a steam-cylinder designed to be placed at any convenient point near the elevator-shaft, and is open at its top, the only head of the cylinder being the one at the bottom thereof.

B is a piston-rod, to which the piston C is rigidly attached. Immediately above this steam-piston and resting upon a frame, D, upon the top of such steam-cylinder, and in axial line therewith, is the cylinder E, provided withthe piston F,passingth rough proper stuffing-boxes, G, in the bottom ofthe cylinderE and projecting through similar stufling-bones, H, in the top of said cylinder E. A communication between the upper and lower ends of the cylinder E is had by means of the passage I, terminating at each end in contracted ports a, the one leading into the top of the cylinder E and the other into the bottom thereof. In the passage I, which is formed by a suitable pipe, are plug-valvesJ and a cut-off valve, K.

L isatank having a mouth, b, through which it may be filled, and the tank communicates by means of a pipe, IWI, having a cut-off valve, N, therein, with the passage I. The upper end of the piston B is secured to a suitable frame, O, carrying a series of sheaves or pulleys, P.

In practice, steam is admitted from the steam-chest Q through the port c to the bottom of the cylinder A, which forces the piston C upward, carrying with it the piston-rod B and the pist-on F, as well as the frame of sheaves.

gust 2, 1884. (No model.)

The pressure of steam would send the pistons upward with great velocity were it not that the cylinder E is iilled with oil or other suitable liquid, so that the upward passage of the pistons is regulated by the capacity of the upward port, a, to discharge the liquid through the passage I into the bottom of the cylinder E, and its capacity may be still further reduced by the proper turning of the plug-valves J, and when the valve K is closed, cutting off entirely the passage of the liquid from one end of the cylinder to the other, immediately the travel of the piston is checked. The piston K should be so arranged as to be operated by the elevator-rope, so that the person in charge of the elevator by the use of this rope inclosing 'such valve may have perfect control of the elevator. The descent of the pistonis governed in the same way, the valve in the steam-chest being reversed to allow the steam in the cylinder A to exhaust itself through the port d. So far as described, the device is designed to be used with steam at high pressure. If it is desired to use low pressure, then the port d is let into the annular condensingchamber It, where it is condensed by a spray of cold water through the nozzles S in the manner well known to all mechanical engineers, or in any other desired way. The water thus condensed passes down the passage or passages T to the well U, whence it is drawn by every upward stroke of the piston B by means of the continuation V thereof, which passes through suitable stuffing-boxes, W, in thebottoru of the steam-cylinder, and is provided with a piston of the ordinary type used in lift-pumps, which latter works in a barrel, X', connected with the well U, from which the water is discharged through the outlet Y at each upward stroke of the piston B.

A series of sheaves, I, over which another or differential series (not shown) of elevatingcable passes, arranged in a well-known manner, enable me to build an elevator wherein the length of the stroke of the piston G may be multiplied at will, so that a short strokesay, for instance, of three feet-may be indefinitely multiplied, such multiplication being determined by the number of sheaves employed to obtain the desired lift of the elevator-platthe exhaust-steam from the cylinder A through form, and by the use of the means for regulat- .ing the speed and controlling the position `of the platform all danger arising from the di- 4 rect use of the steam is avoided.

What I claim as my invention is- 1. The herein-described combined hoisting device and governor, consisting of the cylinders A E in axial line, the former having open'- ings at one end, and the latter provided with the passage-way I, communicating with both ends ofthe cylinder, the plug-valves J, located near the end of such passage, and the sliding valve K, intermediately located between the plug-valves, rod B, passing through both cylinders and carrying the pistons C F, respectively Working in the cylinders A E, frame O, secured to the upper end of the rod B, and carrying a system of pulleys, P, for the pur- DAVID KENNEDY.

Witnesses:

H. S. SPRAGUE, CHIS. 'IHUrnrrAN` 

